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I don't know when you got this but yesterday the download was a folder in a zip file, not a folder "in a zip file in a zip file". Maybe you downloaded it too soon and then he corrected it. Anyway this shouldn't have "file corrupt" as consequence, neither unpacking the file or running the batch.

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I had this problem too - and after some discussion on another thread we discovered the cause.

The server was set to offer GZipped versions of ALL files - which can dramtically reduce server download bandwidth

The receiving browser is supposed to transparently un-GZip the file and return it to its original format

However when using older versions of Internet Explorer a downloaded ZIPfile remains GZipped - which baffles most UNZIP utilities.

Downloading using Chrome or Firefox should work OK - the file is saved as a plain ZIP file as expected.

Apparently this was a known issue with IE6, IE7 and IE8 - but was never fixed. Supposed to be fixed in IE9 and newerDocumented by MS as a fast published "emerging issues" article (2009/2010) - but no fix was ever implemented.

http://support.microsoft.com/kb/2002350The two offered resolutions are basically:Option 1 - Disable HTTP (GZIP) compression for .ZIP files on the web server.Option 2 - Change the MIME type for .ZIP files on the web server from application/x-zip-compressed to application/octet-stream.